Tube-straightening-and-sizing-tool



E. s. CORNELL, JR

TUBE STRAIGHTENING AND SIZING TOOL Filed Feb. 10, 1931 Patented Dec. 6, 1932 FEQ EDWARD S. CORNELL, .13., OF WATEBTOWN, CONNECTICUT, ASSIGNOB TO THE CHASE CDMZPANIES, INCORPORATED, 0F WATFERBURY, OONNECTIUUT, A. CORPORATIQN l GH'IENING-AND-SIZING-TOOL Application filed February 10, 1931. Serial No. 514,779.

This invention relates to an improvement in tube-sizing-and-straightening tools and particularly to tools for straightening and sizing the ends of wrought-metal water-tubes, etc., though its use is not so limited.

It may be stated at the outset of thls description that when the ends of tubing become distorted through accident or rou h handling and an efiort is made to bring t e same back to form by means of a mandrel forced into its interior, though the tube will respond to such treatment, it will not, except on rare occasions, assume its original cylindrical form for the reason that unless the mandrel belarger than the original interior size ofthe tube, it will be found that local stretching has been caused and that certain portions of the tube-wall will remain out ofcontact with the mandrel, a situation which is avoided by the use of the novel straightening-and-sizin tool described herein.

The main 0 ject of this invention is'to provide a simple and convenient tool of the class referred to which will effectively restore the end portion of a water-tube or the like to commercially perfect form.

With the above and other objects in view Q as will appear from tl -.e following, my invention consists in a tube-straightenm -and-sizing tool having an outer sleeve-portion for engagement with the exterior surface of the terminal end of a tube and a coaxial mandrelportion for engagement with the interior surface of the terminal end of a tube; the said coaxial sleeveand mandrel-portions being of different internal and external diameters respectively to provide an annular tube-receivas above an having certain-other details of construction and combinations of parts as will be hereinafter described and particularly recited in the claims.

In the accompanying drawing: Fig. 1 is a side view of a tube-straighteningand-sizing tool embodying my invention;

Fig. 2 is an end view thereof; Fig. 3 is a-transverse sectional view taken on the line 3-3 of Fig. 1;

In the embodiment herein chosen for the I illustration of my invention, Iemploy a tubestraightening-and-sizing tool consisting of a cup-shaped outer member 10 having a cylindrical sleeve-portion 11 and a bottom-wall 12, which latter is formed with a threaded axial bore 13 for the reception'of the exter nally-threaded shank 14 of a mandrel-member'15. The said mandrel-member is provided at its inner end with a shoulder '16" seating against the adjacent face of the bottomwall 12 of the cup-shaped outer member 10, as clearly shown in Figs. 4 and 5 of the drawing. i

The outer end of the mandrel-member 15,-

projects beyond the end of the outer member 10 and is conicallytapered. as at 17 to facilithe sleeve-portion 11, of the outer member 10 is also provided with an outwardly-flaringconical taper 19 for the engagement and inwarddeflection of the outer corner 20 of the tube 18 or the like.

As herein shown, the mandrel-member and the outer member of my improved straightening-and-sizing tool. are shown as separately tateits entry into the terminal end of a tube --18 (Fig. 5). The forward inner corner of formed, which is done for convenience of manufacture, though if desired, the parts may be integral.

My improved tool is preferably driven into the end of a tube by means of a mallet or the like. N ow in the event that the tube being straightened and sized is so badly distorted j as not to be completely restored by the man-' drel-member 15, as is the case with the particular tube shown in Figs. 5 and 6, then the outwardly-flared conical taper 19 of the sleeve-portion 11 of the outer member will accomplish what the mandrel has failed to completely do, and complete the restoraat one and the same time, or the parts may in chosen for illustration, but only as be so proportioned that the conical surface 19 comes into play before the tapered termi nal 17 of the mandrel, but the proportioning of the parts as shown in the drawing in this respect is preferred.

-It will be understood by those skilled in the art that my invention may assume varied hysical forms without departing from my inventive concept and I, therefore, do not limit myself to the specificembodiment hereindicated in the appended claims.

I claim:

1. As a new article of manufacture, a tubestraightening-and-sizing tool having an outer sleeve-portion for engagement with the exterior surface of the terminal end of a tube;

and a coaxial mandrel-portion having a tapered terminal for engagement with the interior surface of the terminal end of a tube the said coaxial sleeveand mandrel-portions bein adapted for operation as a unit in fixed re ation to each-other, and the mandrel-portion being of less external diameter throughout than the internal diameter of the sleeve-portion, to provide an annular tubereceiving space therebetween. V

2. As a new article of manufacture, a tubestraightening-and-sizing tool havin an outer sleeve-portion for engagement wit the exterior surface of the terminal end of a tube; and a coaxial mandrel-portion for engagement with the interior surface of the terminal end of a tube; the said coaxial sleeveand mandrel-portions each having a tapered tube-deflecting surface and being adapted for-operation as a unit in fixed relation to each other, and the mandrel-portion being of less external diameter throughout than the internal diameter of the sleeve-portion, to provide an annular tube-receiving space therebetween.

3. As a new article of manufacture, a tubestraightening-and-sizing tool having an outer sleeve-portion provided with a flaring deflecting-surface for engagement with the exteri'or surface of the terminal end of a tube;

and'a coaxial mandrel-portion having 'a tapered terminal for engagement with the interior surface of the terminal end of a tube; the said coaxial sleeveand mandrel-portions being adapted for operation as. a amt 1n fixed relation to each other, and the mandrelwall; and a separately-forme member arranged coaxially within the said portion being of less external diameter throughout than the internal diameter of the sleeve-portion, to provide an annular tubereceiving space therebetween.

4. As a new article of manufacture, a tubestraightening-and-sizing tool having an outer sleeve-member for engagement with the exterior surface of the terminal end of a tube;

and a separately-formed mandrel-memberarranged coaxially within and in fixed rela-- tion to the said sleeve-member for engagement with the interior surface of the terminal end of a tube; the said coaxial sleevemember and mandrel-member each having a the interior surface of the terminal end of a tube; the said coaxial sleeve-member and mandrel-memberbeing of different internal and. external diameters respectively to provide an annular tube-receiving space therebetween.

6. As a new article of manufacture, a tubestraightening-and-sizin tool having a cupshaped sleeve-member or engagement with the exterior surface of the terminal end of a tube, said sleeve-member havin a bottommandrelcup-shaped sleeve-member and fixed relatively to the bottom-wall thereof for engage-..

ment with the interior surface of the terminal end of a tube; the said coaxial sleeve-' member and'mandrel-member each having a tapered tube-deflecting surface and being of different internal and external diameters respectively to provide an annular tube-receiving space therebetween.

7. As a new article of manufacture, a tubestraightening-and-sizing tool having an outer sleeve-portion for engagement with the exterior surface of the terminal end of a tube; and a coaxial mandrel-portionfor engagement with the interior'surface of the terminal end of a tube; the said coaxial sleeveand mandrel-portions each having atapered tube-deflecting surface, and the mandrel-portion being of less external diameter throughout than the internal diameterof'the sleeveportion, to provide an annular tube-receiving space therebetween; the starting points of the tapered tube-deflecting surfaces of the sleeve-portion and mandrel-portion respectively staggered to cause the same to act successively.

8. As a new article of manufacture, a tubestraightening-and-sizing tool having a tubeengaging end and comprising an outer sleeveportion for engagement with the exterior surface of the terminal end of a tube; and

.a coaxial mandrel-portion for engagement with the interior surface of the terminal end of a tube; the said coaxial sleeveand mandrel-portions each having a tapered tubedeflecting surface, and the mandrel-portion. being of less external diameter throughout than the internal diameter of the sleeveportion, to provide an annular tube-receiving space therebetween; the starting point of the tapered tube-deflecting surface of the said mandrel-portion being nearer the tubeengagin end of the tool than the tapered tube-deiiecting surface of the said sleeveportion to cause the former to first come into play.

In testimony whereof, I have signed this specification.

EDWARD s. CORNELL, JR. 

